The transition from conventional battery cages to cage-free housing is improving welfare for the world's 7 billion egg-laying hens — but important welfare questions remain even in cage-free systems.
Battery cages cause bone weakness from inactivity, feather damage from crowding, and inability to perform dust-bathing, nesting, and perching behaviors that are strongly motivated in hens. Enriched cages partially address this. Cage-free systems have challenges — keel bone fractures and feather pecking — but overall welfare is significantly better.